安装插件
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链接：https://pan.baidu.com/s/1iTPEmu_hCHYhDyaVDDTsVg?pwd=vaw8
提取码：vaw8

安装依赖

yum install pcre pcre-devel
yum -y install make gcc-c++ gcc

编译安装

$ nginx -V   #此处省略了很多模块，只是为了看清而已
...
configure arguments: --prefix=/usr/local/nginx  --add-module=../lua-nginx-module-0.10.8

$ cd /usr/local/src/nginx-1.12.2
#给nginx打补丁（根据nginx版本号选择补丁包），打补丁这步操作不可少，否则会出出"[error] 29841#0: *23 http upstream check module can not find any check server, make sure you've added the check servers," 错误
$ patch -p1 < /usr/local/nginx_upstream_check_module-master/check_1.12.1+.patch  
patching file src/http/modules/ngx_http_upstream_ip_hash_module.c
patching file src/http/modules/ngx_http_upstream_least_conn_module.c
patching file src/http/ngx_http_upstream_round_robin.c
Hunk #1 succeeded at 9 with fuzz 2.
Hunk #2 succeeded at 95 (offset 4 lines).
Hunk #3 succeeded at 159 (offset 4 lines).
Hunk #4 succeeded at 227 (offset 4 lines).
Hunk #5 succeeded at 339 (offset 4 lines).
Hunk #6 succeeded at 381 (offset 4 lines).
Hunk #7 succeeded at 443 (offset 4 lines).
Hunk #8 succeeded at 541 (offset -1 lines).
patching file src/http/ngx_http_upstream_round_robin.h

$ ./configure --prefix=/usr/local/nginx  --add-module=/usr/local/nginx_upstream_check_module-master
....
$ make
$ make install
$ /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
$ /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
 

配置说明

upstream cluster {
  server 192.168.20.12:80;
  server 192.168.20.3:80;     #未启动web服务，默认为down

  check interval=3000 rise=2 fall=3 timeout=1000 type=http;
  check_http_send "GET /index.html HTTP/1.0\r\n\r\n";   #获取后端资源，资源变动后，经历三次检查周期后立即将状态改为down
  check_http_expect_alive  http_2xx http_3xx ; #check_http_send 返回状态码，2xx和3xx为默认值。
}

server {
        listen 80;
        location / {
            proxy_pass http://cluster;
        }
        location = /status {
            check_status;
            #allow xxx;
            #deny all;
       }
}